NOS research and development continually strives to push the performance envelope to the next level. NOS has developed three new dry nitrous kits: a single stage and two dual stage kits. NOS dry Pro Race Fogger kits are designed to be used with stand-alone engine management systems like the Holley Dominator™ and HP™ EFI systems that have programmable dry nitrous capability. This allows for complete control of the fuel, nitrous and ignition for the most repeatable results possible! Kits do not come with a bottle or electrical pack kits.